Air pressurized actuated atomizer

ABSTRACT

This invention relates to guns or atomizers for spraying moulds with a lubricating liquid composition. There is the necessity of a fine adjustment of the liquid rate even to interception for cleaning the moulds with pressurized air only. A connector is attached to the end of the liquid feeding duct and the end of the pressurized air duct and is formed with a decompression chamber and a passage from the liquid feeding duct to the air pressurized duct is controlled by an adjustment screw up to total interception of the liquid rate. Such a screw may be actuated by the operator from the outside and cooperates with two annular sealing members acting as a brake against uncontrolled rotation of the adjustment screw and therefore of the adjusted rate of the liquid.

United States Patent [1 1 Taccon [111 3,791,580 1451 Feb. 12, 1974 AIRPRESSURIZED ACTUATED ATOMIZER Danizzo Taccon, Via G. Di Vittario, 35320099 Sesto S. Giovanni, Milan, Italy 1221 Filed: Jan. 17, 1972 21 Appl.No.: 218,152

Related US. Application Data [63] Continuation of Ser. No. 869,602, Oct.27, I969,

[76] Inventor:

abandoned.

[52] US. Cl 239/414, 239/416.2, 239/434 [51 Int. Cl B05!) 7/04 [58]Field of Search 239/413, 414, 416.2, 426, 434, 239/527, 581, 407

[56] References Cited UNITED STATES PATENTS 1,304,293 5/1919 Foley239/427.5

1,450,000 3/1923 Jockers 239/413 1,462,020 7/1923 Murray 239/416.21,587,736 6/1926 Schenck.... 239/434 X 2,380,827 7/1945 Downs 239/527 X3,179,341 4/1965 Plos et al. 239/414 Johnson et al 239/414 Shashkov239/413 X Primary Examiner-M. Henson Wood, Jr. Assistant Examiner-JohnJ. Love A Attorney, Agent, or FirmEric H. Waters et al.

[ 5 7 ABSTRACT This invention relates to guns or atomizers for sprayingmoulds with a lubricating liquid composition. There is the necessity ofa fine adjustment of the liquid rate'even to interception for cleaningthe moulds with pressurized air only. A connector is attached to the endof the liquid feeding duct and the end of the pressurized air duct andis formed with a decompression chamber and a passage from theliquidfeeding duct to the air pressurized duct is controlled by an ad-.justment screw up to total interception of the liquid rate. Such ascrew may be actuated by the operator from the outside and cooperateswith two annular sealing'members acting as a brake against uncontrolledrotation of the adjustment screw and therefore of the adjusted rate ofthe liquid.

8 Claims, 3 Drawing Figures 1 AIR PRESSURIZED ACTUATED ATOMIZER CROSSRELATED APPLICATION This Application is a continuation of Ser. No.869,602 filed Oct. 27, 196 9, and now abandoned.

BACKGROUND OF THE INVENTION In the art there are known a number ofatomizers or atomizing guns utilizing a jet of pressurized air forspraying a liquid, the liquid to be sprayed being mixed with the air andexpelled as a fine mist, for example against a mould to be cleaned orlubricated.

The atomizing nozzle is adjustable in order to give the possibility ofadjusting the atomization rate. A problem arising from the use of suchatomizers consists in the possibility of adjusting the rate of theliquid such as required by the operator in conformity with the differentwork stages as required by the treatment of a mould surface. Inpractice, liquid variation range from a maximum to a null is required.

An object of the invention is to provide an atomizer provided with meansable to adjust the liquid rate with no addition of expense to the costof manufacture.

SUMMARY OF THE INVENTION This object is attained by providing anatomizer of the kind comprising a support body, a liquid feeding ductand an air pressurized duct connected to the sup-. port body, a deliveryvalve for the pressurized air feeding duct and a delivery valve for theliquid feeding duct, a control lever pivotally mounted on the supportbody, and actuating in a depressed position both said valves, apressurized air nozzle mounted at the end of the pressurized air duct, aconnector member connecting the ends of the pressurized air duct and ofthe liquid duct and formed with a suction chamber, an atomizing nozzleconnected to the said connector and fed through the said suctionchamber, an adjustment screw formed with a head projecting from theconnector to be actuated from the outside and controlling the size ofthe passage between the end of the liquid feeding duct and the suctionchamber, whereby the atomizing nozzle may be fed with a variable liquidrate in dependence of the adjustment of the said adjusting screw. It hasbeen found that a prolonged conical shaped end of the said adjustmentscrew cooperating with a complementary conical hole formed from the saidconnector improves the adjustment possibility of the liquid rate.

Other objects and advantages of the invention will become evident fromthe following description of a preferred exemplary embodiment of theinvention as illustrated in the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWING FIG. 3 is a bottom view according tothe lines C D of FIG. 1.

This atomizer comprises a support body 7 to be connected with two unionsll, 12 the union 11 being in turn connected to a pressurizedair source(not shown) and the union 12 being connected to a reservoir (not shown)of the liquid to be sprayed, for example, against the surface of amould.

As known in the art, there is provided a control lever pivoted to a pin15 fixed to the support body 7 and able to depress two stems 14, 13actuating respectively a first valve (not shown) for the delivery of theliquid from the union 12 to the duct 4 and a second valve (not shown)for controlling the delivery of the pressurized air from the union 11 totheduct 5.

The ducts 4 and 5 are bent and connect to a connector 8, combined, asknown, with an atomizing nozzle 5, the spray of which has been shown atnumeral 9. A transversal duct or passage 2 is formed in the connector,said passage connecting the two ducts 5 and 4. As apparent from thedrawing, the end of the duct 5 is associated with an air nozzle feedingthe air into a chamber formed in the connector, so as to produce a veryhigh velocity of the air.

The high velocity of the air causes a strong suction of the liquid fromthe duct 4 in the direction of the arrow in the transversal duct 2,towards the chamber 30. The liquid passage from the duct 2 to thechamber is,

I according to the invention, controlled by an adjustment screw 6 endingwith a conical prolonged spindle 1, the latter cooperating with acomplementary conical hole formed in the connector body. The arrangementis such that the adjustment screw may be moved to total interception ofthe passage of the liquid to the decompression chamber 30. Anun'threaded cylindrical section of the adjustment screw cooperates withtwo elastic rings 60-60, these rings acting as sealing members and alsoas friction members for resisting the rotation of the adjustment screw.

It is pointed out that some treatment of the moulds requires a feed ofpressurized air mixed with a minimal percentage of liquid, whereby thisadjustment is of great importance. The adjustable nozzle 9 may be lockedin the adjusted position by a stop nut 19. The prolonged conical spindlel of the adjustment screw 6 has given excellent results during practicaltests. As seen in FIG. 2 the axis of the spindle is substantially inalignment with the end of duct 2.

What I claim is:

1. A mould cleaning and lubricating device comprising in combination asupport body, a lubricating liquid feed duct, a pressurized air feedduct, said ducts being a both connected to the support body, a firstdelivery valve for the pressurized air feed duct and asecond deliveryvalve for the lubricating liquid feed duct, a single control leverpivotally mounted on the support body, and actuating in a depressedposition both said first and second valves, an atomizing nozzle mountedat the end of the pressurized air feed duct, a connector body connectingthe adjacent ends of the pressurized air duct and the lubricating liquidduct, said connector body having a decompression chamber, an atomizinghead removably connected to the said connector body and fed through thesaid decompression chamber, a needle valve formed with a head projectingfrom the connec tor body for manual actuation from the outside tocontrol the passage of lubricating-liquid between the end of the liquidfeed duct and the said decompression chamber, by greater or lesserphysical obstruction thereof, whereby the atomizing head may be fed withpressurized air only and with variable liquid rate in dependence of theadjustment of the said needle valve, said connector body having a hollowportion constituted by a conically tapered section extending innarrowing fashion from the inlet for lubricating liquid towards saiddecompression chamber, and a cylindrical section smoothly merging withthe conically tapered section in continuation thereof and openingdirectly into the decompression chamber adjacent the atomizing nozzle,the needle valve including a frustum cone shaped terminal portioncooperating with said hollow portion formed in said connector body, thelongitudinal axis of the hollow portion and the axis of the atomizingnozzle being perpendicular to one another.

2. A device as claimed in claim 1 wherein said needle valve has acentral axis which is aligned with the edge of the atomizing nozzle.

3. A device as claimed in claim 2 wherein said cylindrical section ofthe hollow portion has a smaller length than the tapered section.

4. A device as claimed in claim 1 wherein said cylindrical section andconical section have the same diameter where they smoothly merge.

5. A device as claimed in claim 1 wherein said needle valve includes asmooth cylindrical portion received in said connector body, and twoelastic annular members 4 on said smooth cylindrical portion andengaging said connector body to seal the needle valve in said connectorbody while resisting relative rotation therebetween.

6. A device as claimed in claim 1 wherein said atomizing head isthreadably engaged in said connector body, and a stop nut on saidatomizing head for locking the head in adjusted position.

7. A device as claimed in claim 1 wherein the length of the cylindricalportion of the connector body and the length of the cone shaped terminalportion is such that when said needle valve is engaged with the walls ofthe conically tapered section, the needle valve extends into thecylindrical section of said hollow portion over a substantial portion ofthe length of said cylindrical section.

8. A device as claimed in claim 1 wherein said air feed duct and liquidfeed duct are rigid and formed with a right-angle bend between thesupport body and the connector body.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. v DatedFebruary 1 2,

Danizzo Taccon Inventor(s) It is certifiedthat error appears in theabove-identified patent and that said Letters Patent are herebycorrected as shown below:

On the cover sheet insert [30] Foreign Application Priority Data Italy24417A/68 I NOV. 30 1968 Signed and sealed this 24thday of September1974.

(SEAL) Attest:

MCCOY M. GIBSON JR. C. MARS HALL DANN Attesting Officer Commissioner ofPatents FORM PO-105O (30-691- USCOMMuDC 60376- 59 u.sv GOVERNMENTPRINTING UFFICE: 930

1. A mould cleaning and lubricating device comprising in combination asupport body, a lubricating liquid feed duct, a pressurized air feedduct, said ducts being both connected to the support body, a firstdelivery valve for the pressurized air feed duct and a second deliveryvalve for the lubricating liquid feed duct, a single control leverpivotally mounted on the support body, and actuating in a depressedposition both said first and second valves, an atomizing nozzle mountedat the end of the pressurized air feed duct, a connector body connectingthe adjacent ends of the pressurized air duct and the lubricating liquidduct, said connector body having a decompression chamber, an atomizinghead removably connected to the said connector body and fed through thesaid decompression chamber, a needle valve formed with a head projectingfrom the connector body for manual actuation from the outside to controlthe passage of lubricating liquid between the end of the liquid feedduct and the said decompression chamber, by greater or lesser physicalobstruction thereof, whereby the atomizing head may be fed withpressurized air only and with variable liquid rate in dependence of theadjustment of the said needle valve, said connector body having a hollowportion constituted by a conically tapered section extending innarrowIng fashion from the inlet for lubricating liquid towards saiddecompression chamber, and a cylindrical section smoothly merging withthe conically tapered section in continuation thereof and openingdirectly into the decompression chamber adjacent the atomizing nozzle,the needle valve including a frustum cone shaped terminal portioncooperating with said hollow portion formed in said connector body, thelongitudinal axis of the hollow portion and the axis of the atomizingnozzle being perpendicular to one another.
 2. A device as claimed inclaim 1 wherein said needle valve has a central axis which is alignedwith the edge of the atomizing nozzle.
 3. A device as claimed in claim 2wherein said cylindrical section of the hollow portion has a smallerlength than the tapered section.
 4. A device as claimed in claim 1wherein said cylindrical section and conical section have the samediameter where they smoothly merge.
 5. A device as claimed in claim 1wherein said needle valve includes a smooth cylindrical portion receivedin said connector body, and two elastic annular members on said smoothcylindrical portion and engaging said connector body to seal the needlevalve in said connector body while resisting relative rotationtherebetween.
 6. A device as claimed in claim 1 wherein said atomizinghead is threadably engaged in said connector body, and a stop nut onsaid atomizing head for locking the head in adjusted position.
 7. Adevice as claimed in claim 1 wherein the length of the cylindricalportion of the connector body and the length of the cone shaped terminalportion is such that when said needle valve is engaged with the walls ofthe conically tapered section, the needle valve extends into thecylindrical section of said hollow portion over a substantial portion ofthe length of said cylindrical section.
 8. A device as claimed in claim1 wherein said air feed duct and liquid feed duct are rigid and formedwith a right-angle bend between the support body and the connector body.